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'Some of them have to do with differences in people’s brains that make them more or less susceptible to addiction.

'And we think this difference in brainwave patterns between people at risk and people not at risk is an echo of whatever that underlying biologicaldifference is that makes some people more susceptible than others.'

The findings are being published in the American Journal of Medical Genetics and have been printed in the Biomedical Research Institute's newsletter.

Ms Alamasy added that the picture is 'complicated' and targeting the serotonin receptor may not be the solution.